package com.byx.chatclient.utils;

import java.io.IOException;
import java.io.InputStream;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.concurrent.TimeUnit;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;

/**
 * OkHttpUtils
 *
 * @author Superb
 * @date 2021/4/27 17:58
 */
public class OkHttpUtils {
    private static OkHttpClient instance;

    public static void init() {
        if (instance == null) {
            HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
            loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
            //设置可访问所有的https网站
            SSLUtils.SSLParams sslParams = SSLUtils.getSslSocketFactory(null, null, null);
            instance = new OkHttpClient.Builder()
                    .connectTimeout(10000L, TimeUnit.MILLISECONDS)
                    .readTimeout(10000L, TimeUnit.MILLISECONDS)
                    //配置Log,通过设置拦截器实现
                    .addInterceptor(loggingInterceptor)
                    .hostnameVerifier((hostname, session) -> true)
                    //配置Https
                    .sslSocketFactory(sslParams.sSLSocketFactory, sslParams.trustManager)
                    .build();
        }
    }

    public static OkHttpClient getInstance() {
        if (instance == null) {
            synchronized (OkHttpUtils.class) {
                if (instance == null) {
                    init();
                }
            }
        }
        return instance;
    }

    public static class SSLUtils{
        public static class SSLParams {
            public SSLSocketFactory sSLSocketFactory;
            public X509TrustManager trustManager;
        }

        public static SSLParams getSslSocketFactory(InputStream[] certificates, InputStream bksFile, String password) {
            SSLParams sslParams = new SSLParams();
            try {
                TrustManager[] trustManagers = prepareTrustManager(certificates);
                KeyManager[] keyManagers = prepareKeyManager(bksFile, password);
                SSLContext sslContext = SSLContext.getInstance("TLS");
                X509TrustManager trustManager = null;
                if (trustManagers != null) {
                    trustManager = new MyTrustManager(chooseTrustManager(trustManagers));
                } else {
                    trustManager = new UnSafeTrustManager();
                }
                sslContext.init(keyManagers, new TrustManager[]{trustManager}, null);
                sslParams.sSLSocketFactory = sslContext.getSocketFactory();
                sslParams.trustManager = trustManager;
                return sslParams;
            } catch (NoSuchAlgorithmException e) {
                throw new AssertionError(e);
            } catch (KeyManagementException e) {
                throw new AssertionError(e);
            } catch (KeyStoreException e) {
                throw new AssertionError(e);
            }
        }

        private static class UnSafeHostnameVerifier implements HostnameVerifier {
            @Override
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        }

        private static class UnSafeTrustManager implements X509TrustManager {
            @Override
            public void checkClientTrusted(X509Certificate[] chain, String authType)
                    throws CertificateException {
            }

            @Override
            public void checkServerTrusted(X509Certificate[] chain, String authType)
                    throws CertificateException {
            }

            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return new java.security.cert.X509Certificate[]{};
            }
        }

        private static TrustManager[] prepareTrustManager(InputStream... certificates) {
            if (certificates == null || certificates.length <= 0) {
                return null;
            }
            try {
                CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
                KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
                keyStore.load(null);
                int index = 0;
                for (InputStream certificate : certificates) {
                    String certificateAlias = Integer.toString(index++);
                    keyStore.setCertificateEntry(certificateAlias, certificateFactory.generateCertificate(certificate));
                    try {
                        if (certificate != null) {
                            certificate.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                TrustManagerFactory trustManagerFactory;

                trustManagerFactory = TrustManagerFactory.
                        getInstance(TrustManagerFactory.getDefaultAlgorithm());
                trustManagerFactory.init(keyStore);

                TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();

                return trustManagers;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;

        }

        private static KeyManager[] prepareKeyManager(InputStream bksFile, String password) {
            try {
                if (bksFile == null || password == null) {
                    return null;
                }
                KeyStore clientKeyStore = KeyStore.getInstance("BKS");
                clientKeyStore.load(bksFile, password.toCharArray());
                KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
                keyManagerFactory.init(clientKeyStore, password.toCharArray());
                return keyManagerFactory.getKeyManagers();

            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        private static X509TrustManager chooseTrustManager(TrustManager[] trustManagers) {
            for (TrustManager trustManager : trustManagers) {
                if (trustManager instanceof X509TrustManager) {
                    return (X509TrustManager) trustManager;
                }
            }
            return null;
        }


        private static class MyTrustManager implements X509TrustManager {
            private X509TrustManager defaultTrustManager;
            private X509TrustManager localTrustManager;

            public MyTrustManager(X509TrustManager localTrustManager) throws NoSuchAlgorithmException, KeyStoreException {
                TrustManagerFactory var4 = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
                var4.init((KeyStore) null);
                defaultTrustManager = chooseTrustManager(var4.getTrustManagers());
                this.localTrustManager = localTrustManager;
            }


            @Override
            public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {

            }

            @Override
            public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                try {
                    defaultTrustManager.checkServerTrusted(chain, authType);
                } catch (CertificateException ce) {
                    localTrustManager.checkServerTrusted(chain, authType);
                }
            }


            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[0];
            }
        }
    }
}
